/usr/share/doc/libqrupdate-dev/README

QRUPDATE: A LIBRARY FOR FAST UPDATING OF QR AND CHOLESKY DECOMPOSITIONS
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The following operations are supported:
QR rank-1 update (qr1up)
Updates the QR factorization after an additive rank-1 update to the
original matrix (A = A + u*v'). Works for full & economized
factorization.
QR column insert (qrinc)
Updates the QR f
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